Question

The de Broglie wavelength of a tennis ball of mass $60$ g moving with a velocity of $10$ m/sec is approximately :

• A. ${10}^{-33}$ m
• B. ${10}^{-31}$ m
• C. ${10}^{-16}$ m
• D. ${10}^{-25}$ m

Answer 1

Answer: (A)

${10}^{-33}$ m

De-Broglie wavelenght is given by:

$\lambda =\frac{h}{mv}=\frac{6.62\times {10}^{-34}}{60\times {10}^{-3}\times 10}\approx {10}^{-33}$ m